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Home > All Images > 1997 > May > 13 May 1997

Images Dated 13th May 1997

Choose from 8 pictures in our Images Dated 13th May 1997 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.


Artwork of a section through an artery and vein Featured 13 May 1997 Image

Artwork of a section through an artery and vein

Vein and artery. Artwork of a section through a vein (blue, at left) and an artery (red, at right). Veins carry deoxygenated (blue) blood to the heart, arteries take oxygenated (red) blood from the heart. Low pressure blood is helped up the thin-walled vein by the contraction of the surrounding muscles (pink). Valves in the vein lining ensure that blood can only flow one way. The artery carries high pressure blood and has thick, muscular walls. The layers of the artery wall are unfurled at top. A tough outer coat surrounds the muscle (striped), an elastic layer (holey) and a single celled inner layer

© HANS-ULRICH OSTERWALDER/SCIENCE PHOTO LIBRARY